Fine Structure and Dipole Moment of Metastable a3Π Carbon Monoxide

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Abstract
The radio‐frequency spectrum of the first four (υ = 0–3) vibrational states of the a 3 Π metastable state of 12C16O has been measured in molecular beam electric resonance from 0 to 500 MHz. Lambda doubling transitions have been observed in J = 2–7 of Ω = 2 , and in J = 1 and 2 of Ω = 1 at zero electric and magnetic field and as a function of electric field. An exhaustive reanalysis of a 3 Π optical data is presented, in which the spin–orbit, rotational, spin–spin dipole–dipole, and potential‐energy parameters have been accurately determined. Together with parameters determined from the rf spectrum, the resulting set of fine structure parameters predicts the complete lambda doubling spectrum to better than 1 in 104 for J = 0–50 , υ = 0–3 . The predicted frequencies below 5 GHz are tabulated for possible radio‐astronomical measurement of a 3 Π CO. The Stark effect allows the a 3 Π dipole moment to be determined to an absolute accuracy of 2 in 104, and the small dependence upon spin–orbit, vibrational, and rotational state has been accurately measured.

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